Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1986-09-26
1989-05-09
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
B25B 1700
Patent
active
048278084
ABSTRACT:
A rotary power tong for use in well drilling operations to make up and break out drill strings or similar axially elongated objects having a housing receiving a rotor assembly therein for actuating jaw members into the drill string for rotation of the drill string. The rotor assembly has a generally annular rotor with a plurality of axial bores therethrough positioned in a generally circular pattern adjacent the outer periphery of the rotor. Each axial bore receives a roller assembly comprising a shaft received through the axial bore and secured to the rotor and a roller bearing secured to the bottom of the shaft extending below the rotor. The roller bearing rotates relative to the shaft and rotor. The rotor assembly is received within a circular guide track within the housing such that the rotor assembly load is balanced evenly within the housing providing for a smooth rotational operation of the power tong. The unique rotor design allows the roller assemblies to be repaired or replaced without removing the rotor from the housing assembly.
REFERENCES:
patent: 3540326 (1970-11-01), Dickman et al.
patent: 3875826 (1975-04-01), Dreyfuss et al.
patent: 4215602 (1980-08-01), Carstensen et al.
patent: 4250773 (1981-02-01), Haynes et al.
patent: 4437363 (1984-03-01), Haynes
Haynes Charles W.
Pitts Adrian E.
Cooper Industries Inc.
Hartman Judy J.
Rose David Alan
Schmidt Frederick R.
Scott Eddie
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